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Study of the famous problem of the metal tube that can pass through the corner of a hallway knowing the widths of the hallway before and after the corner. More exercises on differential calculus applications: • APPLICATIONS OF DIFFERENTIAL CALCULUS.... LINK TO THE BOOK from which I took the exercise https://amzn.to/41oaYFP Contents Problem statement 00:01 Geometric considerations 2:21 Length equation and meaning 5:14 Obtaining the critical angle 11:33 Solution and final conclusion 17:11